body{
	background: #f5f5f5;
	position: relative;
}
.yonghu img{
			width: 100%;
			height: 100%;
		}
.headaL{
	width: 2rem;
    height: 2.5rem;
    position: fixed;
    left: 1rem;
    top: 3rem;
}
.headaL img{
	width: 1.5rem;
	height: 100%;
}